A good energy plan before 3 hours of training is about topped-up stores, a calm stomach, and a clear strategy for fluids and carbohydrates.
- Eat a carbohydrate-rich main meal 3–4 hours before the start with moderate protein and limited fat and fibre.
- Use a small, easy-to-digest snack 30–60 minutes before if it has been a long time since your last meal, or if the session starts hard.
- Drink steadily leading up to training, and consider electrolytes if you sweat a lot or it’s hot.
- Also plan carbohydrates during the session, as 3 hours often requires ongoing energy.
Long 3-hour sessions can be some of the most motivating moments in your training – and also some of the most demanding. Often, the difference isn’t just fitness, but also what – and when – you’ve eaten and drunk beforehand. With a well-thought-out energy plan, you can show up with full energy stores, a stomach that feels calm, and a better foundation for maintaining a steady level throughout the entire session.
In this guide, you’ll get concrete and simple advice on what you can eat and drink before a 3-hour training session, so you can test and adjust your strategy on your next long ride/run.
The goal before 3 hours of training is calm energy and a calm stomach
Before a 3-hour training session, it basically comes down to three things:
Most important before the start
- Full glycogen stores as the energy reserve in muscles and liver
- Stable blood sugar when you get going
- A stomach that feels light, calm, and ready to work
That’s why it can make sense to focus on carbohydrate-rich, easy-to-digest meals, moderate amounts of protein, and limited amounts of fat and coarse fibre in the final hours before the start.
Some classic things that can challenge you along the way are:
- A large, fatty, or very high-fibre meal 1–2 hours before, which can give a heavy feeling in the stomach and a need for extra bathroom stops
- Too little carbohydrate in the day and hours leading up to it, so your energy level can feel lower earlier in the session
- Too little fluid or only water despite high sweat loss, which can affect fluid balance and perceived performance
How to eat 3 to 4 hours before the start
The big main meal 3–4 hours before can be your opportunity to build a stable foundation for a 3-hour session. Here you can build energy stores and give your body time to digest the food.
A good starting point is:
- High carbohydrate content
- Moderate amounts of protein
- Limited amounts of fat and coarse fibre
Examples of meals 3–4 hours before training:
- Oatmeal made with milk or water with banana and a little honey
- White pasta or rice with a bit of chicken or fish and a mild tomato or pasta sauce
- White bread or rolls with lean toppings such as chicken, turkey, or cheese, and a bit of fruit on the side
- Potatoes with a bit of chicken or fish and cooked, not-too-coarse vegetables
If you train very early, it can be difficult to get a large meal in that long before. Instead, you can for example:
- Eat an extra carbohydrate-rich dinner the day before
- Have a smaller breakfast meal such as oatmeal or white bread 1.5–2 hours before
- Make a plan for a steady intake of carbohydrates during the training itself
If you want to dive deeper into meal timing around training, you can read the guide on timing meals before training.
How to use snacks in the final 60 to 30 minutes
Even with a solid main meal, a long time can pass before you’re ready to train. Especially if the intensity is high from the first minute, a small, well-chosen snack closer to the start may be relevant for some.
A snack typically makes sense if:
- More than 3–4 hours pass from the main meal to the start
- You often get hungry or feel low on energy midway through the first hour
- You know the session starts hard
Examples of snacks 30–60 minutes before training:
- A banana
- A small white roll or toast with honey or jam
- A small energy bar or half an Energy Snack
- An energy gel or a bit of energy chews along with a little water
Keep the snack simple and easy to digest. Large amounts of fat, such as butter and peanut butter, and lots of coarse fibre such as rye bread and large amounts of raw vegetables close to the start can feel heavy for some.
Fluids and electrolytes before your training
Showing up well-hydrated is an important part of preparation, just like showing up with full carbohydrate stores. Both can be part of your overall plan for food and drink around training.
A simple strategy could look like this:
- Drink steadily throughout the day leading up to training and avoid very large amounts at once
- Take small sips during the last 1–2 hours before, for example a total of 200–500 ml depending on heat and body weight
- Avoid drinking very large amounts right before the start, as it can cause stomach discomfort and frequent bathroom trips
During longer training and high sweat rates, you lose not only fluid, but also salts. For some, it may be relevant to think beyond water alone:
- Water is often fine for cool, easy sessions if you sweat moderately
- A drink with electrolytes can support electrolyte balance and may be relevant if you sweat a lot or train in the heat
PurePower has several solutions that can make it easy to work with salt intake in connection with training, for example electrolytes for fluid balance. It can be a practical way to plan fluids and salts.
If you want to combine carbohydrates and electrolytes in the same bottle, an energy powder such as Carbo Race Electrolyte can be a practical solution before and during longer sessions.
Energy during 3 hours of training
Even though the focus here is on what you eat beforehand, 3 hours is long enough that it will often be relevant to top up with carbohydrates along the way. This applies even if you’ve nailed your meals leading up to it.
Many endurance athletes use the following as a starting point:
- Approximately 0.5–1 gram of carbohydrate per kilogram of body weight per hour for training lasting over 2 hours
For a 70 kg athlete, that corresponds to around 35–70 grams of carbohydrate per hour. For example, it can be distributed like this:
- 500–750 ml energy drink combined with some gels or energy chews spread out over time
- A combination of energy drink and small snacks such as banana, half a bar, or a couple of chews
A simple structure can be:
- The main part of your carbohydrates from your bottle, for example from energy drinks and energy powders for long training
- Supplemented with gels, chews, or small snacks as you approach the end of each hour
Always test your strategy in normal training sessions before using it for a run or race. Over time, the body can adapt to intake during exercise, and individual differences matter.
Practical checklist for your own energy plan
Use this template as a starting point and adapt it to your daily life and your stomach:
Your energy plan before and during training
- The day before: Eat carbohydrate-rich meals such as rice, pasta, potatoes, bread, and grains, and make sure to drink fluids steadily throughout the day
- Three to four hours before: Eat a larger meal focusing on carbohydrates, moderate protein, and limited fat and fibre, for example oatmeal with banana and honey or pasta with chicken and a mild sauce
- One to two hours before: Have a smaller snack as needed, for example yogurt or skyr with a bit of muesli and fruit or a couple of slices of bread with lean toppings
- 30 to 60 minutes before: Choose a small snack such as a banana, a white roll with a sweet spread, a small bar, or a gel, and take a few small sips of water or an electrolyte drink
- During training: Have a concrete plan for carbohydrates and fluids, for example an energy drink combined with gels or chews, and consider electrolytes—especially if you sweat a lot or train in the heat
For 3-hour sessions, PurePower has gathered a range of obvious products in the collection training 3 hours, where you’ll find combinations of energy drinks, gels, chews, and recovery products aimed at endurance training.
Frequently asked questions about food before 3 hours of training
How long before a 3-hour training session should I eat the main meal?
A rule of thumb is to aim for 3–4 hours before, so you have time to digest the food and reduce the risk of feeling heavy.
What is a good main meal before 3 hours of training?
A meal that is predominantly carbohydrate, with moderate protein and limited fat and fibre. For example, oatmeal with fruit or pasta/rice with a bit of chicken and a mild sauce.
Should I eat again 30–60 minutes before?
Many can benefit from a small carbohydrate-rich snack such as a banana, a white roll, a small energy bar, or a gel—especially if it’s been a long time since the main meal or if the training starts at high intensity.
Is it necessary to eat during a 3-hour training session if I’ve eaten well beforehand?
It often makes sense to supplement with carbohydrates along the way when you’re going for more than about two hours, so you can better support a stable energy level.
Should I avoid fatty food and lots of fibre before a 3-hour training session?
Most people experience a calmer stomach by reducing fat and coarse fibre in the final hours beforehand, especially before high-intensity training.
What if I get stomach pain?
You can try simplifying the meal with less fat and fibre, spreading the food out over a bit more time, diluting the energy drink slightly, and reducing the amount of carbohydrates—then gradually building back up again if it works for you.
Who should pay extra attention?
If you have medical conditions or special considerations such as diabetes, gastrointestinal disease, or pregnancy, it’s a good idea to talk to a doctor or clinical dietitian before making major changes to diet and training.
Use this guide as a starting point and test your plan on completely normal training sessions. When you adjust based on how your body responds, you can show up better prepared next time you have to get through 3 hours with a high heart rate and want to maintain a steady level all the way.